Work-securing mechanism.



W. L. SGHELLENBAGH.

WORK SEGURING MEGHANISM.

APPLICATION FILED JULY 15, 1914.

Patented Mar. 23, 1915. l

2 SHEETS-SHEET l.

W. L. SCHBLLENBAGH.

WORK SECURING MEGHANISM.

' APPLICATION FILED JULY l5, 1914. L1 339064, Patented Mar. 23, 1915.Y

2 SHEETS-SHEET Z.

El l

WILLIAM L. SCHELLEN-BACH, OF HARTWELL, OHM).4

WonK-sEURINe mncnenrsm.

i Specication of Letters Patent.

:ie-atenten raar. saisie.

application aieaauly's, 1914. serial No. 851,221.

T0 ZZZ @from it may concern:

Be 1t known that I, WILLIAM L. SCHEL- LENBACH, a citizen of the United States, re

siding at Hartwell, in the county of Hamil-- ton and State of Chio, have invented a new and useful Improvement in Work-Securing Mechanism, of which the following specifi` cation is a full disclosure.

This invention' relates to an improvement in lathes and deals more particularly with work' engaging and driving devices formingv elements of' the head and tail-stocks thereof'.

One of' the objects of theinvention is to provide atranslatory, rotative work engaging and driving member translated cordinately with the longitudinal movements of the tail-stock spindle to sequentially move said spindle and work driving member toward and from a work engaging position without stopping the machine.

Another object is to provide a tail-stock spindle translated by an `operating mem ber having a uniform stroke and provided with compensating means effective during a movement to a work engaging position.

Another object is to provide a translatory rotative work engaging and driving member translated cordinately with the movements of the tail-stock spindle and means for locking said spindle in its work engaging position, all operated by a single operating handle, while the machine is in constant opera.- tion.

Another object is to provide means for operating'the tail-stock center or spindle coordinately relative to the functioning of the work engaging member.

Another object is to provide a means for sequentially translating the tail-stock spindle and Work engaging and driving member toward and from each other while the ina.- chine is in constant operation to engage and disengage the work, thereby permitting a yremoval of a piece of finished work and the chucking of a new piece of Work without stopping the machine.

In the drawings, forming a part of this specification, isshown the principle of the invention as it is to be embodied in a typical lathe organization, although the selected application is not an inherent limitation of the invention, and in which drawings, Figure 1 is a top plan view. Fig. 2 is a centi-al vertical section. Fig. 3 is an elevation of the f ace of the head-stock. Fig. 4 is a section on line 4 4, Fig. 2. Fig. 5 1s a detail section on line 5-5, Fig. 1. i The head-stock 1, has the driven spindle sleeve 2, on the end of which is the internally .threaded spindle nose 3, the live center 4 bellong secured in an end of the spindle sleeve ore. in the head-stock, and an annular work dog seat m(5 is screw threaded into the spindle nose. The outer periphery of the seat 6 is formed with the long.tudinal splines 7 an externally grooved annulus 8 is supported on seat (i. The work dog 9 has theradial arms 9EAL for engaging studs 10 operating in the seat splines 7 and secured to the annulus 8 by pins 11, whereby the dog 9, its arms 9a, and the studs 10 rotate asia unit, the. annulus 8 being longitudinally movable relative to the seat 6, which is fixed to the spindle nose, the work -12 being concentrically secured in the dog 9, and the ends of the work being centered on the head-stock live center 4 and the tail-stock center-18. 0n the headstock'is av bearing post 14 longitudinally slidably supporting the operating rod 15. On `said rod 15 is a block 16, from which depends a stirrup 17 engaging into the 'groove 19 of rotating annulus 8 "so as to reciprocate said annu-lus and studs on the rotating seat 6, when rod 15 is appropriately shifted. Also preferably, from block 16 is depended a semi-cylin-drical shield 2() partly enveloping the head-stock end of the work The tail-stock 21 has the spindle sleeve '22, in which is the spindle stem 23 carrying the center 13, said stem being longitudinally adjustable in sleeve 22, and

clamped therein by mechanism controlled' concurrently with the operation of rod 15,

motion, whereby the member in sliding overL the pin as an axis, appropriately applies or The usual bearing sleeve 5 is provided,

20 mg shaft 29 controls the shift of rod 15,

releases the tension of spring 26, and thereby advances or retracts spindle stem 23 for engaging or d sengaging the work l2.

To positively operate the member 24, and for ctncurrently operating the rod 15 and the tail-stock `spindle clamp, the following actuating mechanism is provided :-In the rear end of the tail-stock is a rock shaft 29 transverse to the spindle and having an operating handle 30. A rock lever 3l is intermediately fulcrumed on the upper, rear portion of the tail-stick, to the upper end of which is secured the rear end of rod 15, so that as lever 31 is appropriately rocked the rod 15 will be advanced or retracted to reciprocate the work d g engaging studs on thedriven cr head-stock spindle. The lower end of lever 31, has a pin 32, engaged by a shoulder 33, cn a rock disk 34, fixed to rock shaft 29, whereby the operation of actuatand hence longitudinally reciprccates the work dog engaging studs 10 relative to the head-st( ck spindle. ne under medial pcrtion of the rear end of the tail-stock sleeve is cut out to give access to the mechanism for reciprocating member 24, which comprises a rock detent member' 35 fixed to the-A medial portion of shaft 29, and coacting with the indent 36 in the under side of the reciprocating tail-'stock actuator 24. r[hereforewhen shaft 29 is appropriately rocked it longitudinally shifts the annulus 8 and dog engaging studs 10, and concurrently operates member 24, to apply or release endwise tension on the tail-stock spindle stem 23, thereby advancing or retracting the tailstock spindle 23 appropriately to the movement of the annulus 8, for securing or releasing work between the live and dead centers. That is, in the position shown in Fig, l, member 24 is at theI forward end of its shift, spring tension being applied on the end of the tail-stock spindle stem to advance the spindle 23 into work engaging position, and at the same time member 34 has shifted rrd 15 in the opposite direction to appropriately advance the annulus 8, so that its studs 10 engage on opposite sides of the work dog arms 9a. On the reverse movement of shaft 29, lever 33 and rock member 34 will shift rod 15 toward the head-stock to release the studs 10 fromv engagement with drg arms 9a, and at the same time, detent member 35 will engage therear shoulder of indent 36, shifting member 24 rearwardly until its end strikes the'pin-head 27, whereby the spindle 23 will be positively retracted to disengage the Work. But itis also necessary to concurrently actuate the tail-stock spindle clamp, which clamping and actuating mechanism comprise a transverse bearing sleeve 37 on the under side of stock, or their spindles.

' spindle.

vhead 43, and between the bolt and sleeve heads 42, 43, is loosely secured the forward end of a clamp actuating rod 44, so that as said rod is appropriately moved in a horizontal plane, the clamp sleeves 38, 39, are drawn together or moved -away from one another to clamp or unclamp the tail-stock spindle. The rod 44 is rearwardly extended and supported movably on `the projecting end 45 'of rock shaft 29. 'Near this end of rod 44 is formed a cam slot 46, into which is coactively projected a pin 47 from the rear face of rock disk 34, so that an appropriatey movement of shaft 29 cams the rear end of rod 44 outwardly on shaft end 45, thereby tensionally actuating theforward end of said rod relative to the sleeve and clamp-bolt heads 42, 43,` to draw the sleeves together or move them apart for clamping or unclamping the tail-stock spindle stem, and this function is effected cordinately with .and appropriate to the movements of the work dog studs and the longitudinal movements of the tail-stock spindle 23, thus enabling the work dogs engagingl studs and secured Work bar, and without the necessity The pin of stopping the head-stock drive, and spring having relative longitudinal mo'- tion to the positivelyL reciprocating actuator for the tail-stock spindle positioning, provides an automatic compensation enabling the securance of diderent length work between centers without manual relative longitudinal adjustment of the head or tail- Thus in-securing work a given primary actuation is concurrent relative to all three mechanisms functioning under the single control, but the coaction is cordinate, in the sense that the effective functions areJsequential or operative in timed movements, to first longitu-l dinally and automatically position the tailstcck spindle for centering the Work, second, to clamp the tail-stock in Work engaging position, and third, shift the drg engaging device. Although the timed intervals are slight, they are functionally effec- .tive at `three distinct periods in the rotation of the primary, common controlling rock shaft 29, while for releasing the work the sequential order is to first release the dog drive, second to unclamp the tail-stock spindle, and third, to -retract the tail-stock Having described the ll claim 1. In a device of the class described,in combination with a driven head-stock, spi-n invention,

lll@

v spindle.

and means operated from the tail-'stock for translating said annulus.

2. ln a device of the class described, in`

combination AWith a head-stock, its driven spindle, and a tail-stock and its spindle, a work, dog engaging device at the head-stock adapted to be translated thereon, and means on tlietail-stock for translating said device.

3. ln a device of the classdescribed, a head-stock spindle, a tail-stock spindle, tailstock operating means, an externally grooved annulus to be translated on the head-stock spindle, a work dog engaging device on the annulus, and longitudinally shifting means engaging the annulus groove to translate the same While in rotation, said shifting means being extended to the tailstock and connected to the tail-stock operating means, for cordinately operating the Work dog engaging device and the tail-stock 4. ln a device of the class described, a head-stock spindle, a member to be translated thereon, a Work dog engaging device on said member, a tail-stock, a spindle to be translated thereon, and means for coordinatelytranslating said member and tailstock spindle While lthe head-stock spindle is in operation.

5. 1n a device lof the class described, a Ahead-stock driven spindle, a Work dog engaging device fixed to rotate with and move longitudinally of the spindle, a tail-stock. a spindle to be reciprocated therein, and means for cordinately operating said device and tail-stock spindle While the headstock spindle is in motion.

6. ln a device of the class described, in combination With 'head and tail-stock spindles, the head-stock spindle being driven and the tail-stock spindle longitudinally adjustable, a Work dog engaging device fixed to rotate With and move longitudinally of the head-stock spindle, andmeans for co.

ordinately moving the said device and tailstock spindle into or out of position for engaging the dog-operated Work.

7. ln a device of the class described, in combination with head and tail-stock spindles, the head-stock spindle being driven andtheA tail-stock spindle longitudinally ad,

justable, a Work dog engaging device fixed to rotate With and move 'longitudinally of the head-stock spindle, and means on the tail-stock for cordinately lmoving the said device and tail-stock spindle into or out of position for engaging the dog-operated Work.

' 8. In a device of the class described, in

combination with head and tail-stock spin dles, a Work dog engaging device fixed to rotate with and move longitudinally .of the head-stock spindle, the tail-stock being longitudinally adjustable, means for locking the tail-stock spindle in adjusted position, and means for cordinately operating the said device, tail-stock spindleadjustment, and tail-stock clamping mechanisms.

9. in a device of the class described, in combination With a head-stock and its live spindle, anda tail-stock with a dead spindle longitudinally adjustable therein, a

member lixed to rotate with and reciprocate longitudinally of the live spindle, means for adjusting the tail-stock spindle, means for locking the tail-stock spindle, means for coordinately adjusting said live spindle device, said tail-stock spindle and for locking said tail-stock spindle. and an actuator com mon to said cordinated operating mechanisms.

j 10. In a device of the class described, in combination with the head-stock and its live spindle, and with a tail-stock'having a longitudinally adjustable deadv spindle, a Work dog engaging device fixed to rotate with and move longitudinally of the live spindle,.means for adjusting the tail-stock spindle, means for lshifting the said live spindle device, mechanism between said shaft and the device shifting means, and mechanism between said shaft and said tailstock spindle adjusting means, said .mechanisms being arranged to cordinately operate said device and tail-stock spindle to engage or disengage the dog-secured Work. f

11. In a device of the class described, a tail-stock having a longitudinally adjustable spindle, an actuator for the spindle, a spindle clamp mechanism, a rock shaft having'a member for reciprocating said actuating member, a clamp actuating rod, and a device on said rock shaftl for caming the actuating rod. l

12. In a device of the class described, a head-steek and its live spindle, a tail-stock having a longitudinallyv adjustable spindle, a Work dog engaging device fixed to rotate With and reciprocate on the head-stock spindle, a rod for shifting said device While the spindle is in rotation, a rock shaft in the tail-stock, a member actuated by said shaft for .adjusting ,the tail-stock spindle, or tailstock spindle clamp, a rod for operating said clamp, a member on said rock shaft for operating the shift rod to the head-stock, and a member on said rock shaft for operating said clamp actuating rod for the tail-stock spindle.'

13. n a device ofthe nature disclosed comprising a tail-stock having a longitudinally adjustable, Work-engaging, dead spindle, a reciprocating spindle actuating mem# ber having a uniform stroke Within the tailstock, a compensating -means for transmit- Work engaging position to subsequently abactuating member to the spindle to advanceA said spindle to a work engaging' position to subsequently absorb excess movement of the actuating member, and means for clamping said spindle in work engaging position.

15. 1n -a device of the nature disclosed comprising a tail-stock having a longitudinally adjustable, work-engaging, dead spindle, a reciprocating spindle actuating member having a uniform stroke, a compensating means for transmitting the movement of the actuating member to the spindle to advance said spindle to a work engaging position to subsequently absorb excess movement of the actuating member, and means for clamping said spindle in work engaging position, and a common actuating means for cordinately functioning both devices.

16. ln a device of the nature disclosed comprising a tail-stock having a longitudinally adjustable, Work-engaging, dead spindle, a reciprocating spindle actuator having a uniform stroke, and a spring for transmitting the movement of the actuator to the spindle to advance said spindle to a workengaging position and to be subsequently tensioned by excess movement of said actuatorto compensate for the difference in the length of actuator stroke and the stroke of the spindle to work engaging position.

17. ln a device of the nature disclosed comprising a tail-stock having aA longitudinally adjustable, work-engaging, dead spindle, a reciprocating spindle actuator having a uniform stroke, and a spring for transmitting the movement of the aactuator to the spindle to advance said spindle to a Work engaging position and to be subsequently tensioned by excess movement of said actuator to compensate for the difference in the length of actuator stroke and the stroke of the spindle to work engaging position, and means for clamping the spindle in work engaging position.

18. comprising a tail-stock having a longitudinally adjustable, work-engaging, dead spindle, a reciprocating spindle actuator having a uniform stroke, and a spring for transmitting the movement of the actuator to the spindle to advance said spindleto a work engaging position and to be subsequently tensioned by excess movement of said actuator to compensate for the difference in the length of actuator stroke and the stroke of the spindle to work .engaging position,

ln a device of the nature disclosed` ideama means for clamping the spindle in Work engaging position, and a common actuating means for cordinately functioning both devices.

19. 1n a device of the nature disclosed comprising a tail-stock having a longitudinally adjustable dead spindle, a. reciprocating spindle actuator, a compensating spring intermediate the spindle and actuator for transmitting the forward movement of the actuator to the spindle to advance said spindle to a work engaging position, and an abutment on the spindle adapted to be engaged during the rearward movement of said actuator to positively retract the spindle.

2O. lin a device of the nature disclosed comprising a tail-stock having a longitudinally adjustable dead spindle, a reciprocating spindle actuator, a compensating spring intermediate the spindle and actuator for transmitting the forward movement of the actuator tothe spindle to advance said spindle to a work engaging position, means for clamping the spindle in work engaging position, and an abutment o'n the spindle adapted to be engaged during the rearward movementof said actuator to positively retract the spindle.

21. lln a device of the nature disclosed comprising a head-stock having a live center and a tail-stock having a dead center, an actuating member for the dead center having a predetermined stroke and a compensating means intermediate the dead center and said actuating member'adapted to frictionally support a piece of work between the centers and to compensate for differences in lengths of movement of the dead center toward the" live center, dependent upon different vlengths of work pieces and relative to the predetermined stroke Aof the actuating member.

22. ln a device of the class described, a

tail-stock, a longitudinally adjustable spindle, a uniform stroke actuator, a compensating mechanism intermediate the spindle and actuator having relative longitudinal automatic movement, and means for reciprocating said actuator. y

23. In a device of the class described, a tail-stock, a longitudinally movable spindle having a rearwardly projected stem formed with an abutment end, a reciprocating actuator in the tail-stock movable relative to the stem, and a spring on said stem intermediate the spindle and actuator.

24. 1n a device of the class described, in combination with a head and tail-stock and their live and dead spindle centers, a work dog engaging device to be translated relative to the live spindle while in motion, means for longitudinally adjusting the tailstock spindle, means for clamping the said spindle in kadjusted position, and a single,

control cordin'ated mechanism for first adjusting the spindle, second, clamping it, and third, engaging the dog for securing Work, and transposinff said sequence for releasing.

25. In a device of the class described, in

combination, with a head-stock and its driven spindle, and With a tail-stock having a longitudinally adjustable spindle, a Work dog engaging device, shifting means therefor, means for shifting the tail-stock spindle, and means for locking said spindle, a common actuating mechanism, and cordinated motion transmission devices controlled by said actuating mechanism for sequentially functioning the dog engaging and tail-stock positioning means. j

26. In a device of the class described comdead spindle, a Work enga ging member fixed to rotate with and reciprocate longitudiv nally of the live spindle, means for locking v the dead tail-stock spindle, and means'for cordinately adjusting the Work engaging member and for locking the dead tail-stock Spindle.`

In Witness whereof, I hereunto subscribe my name, as attested by the two subscribing w tnesses.

WILLIAM L. SCHELLENBACH.

Witnesses EMMA SPENER, L. A. 13E/JK. 

